Internal Friction Study of Phase Transformations and Hydrogen Effects in Super duplex stainless Steels

O. Smuk, Hannu Hänninen, Yu. Yagodzinskyy, O. Tarasenko, S. Smuk

    Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

    Abstract

    Internal friction method was applied to study phase transformations and secondary phase precipitation in super duplex stainless steels (DSS). Rather well documented SAF 2507 duplex stainless steel was selected for the testing. Several internal friction peaks were detected. Two peaks observed at lower temperatures were recognised as nitrogen Snoek peaks in ferrite and austenite phases. The high-temperature peak was attributed to the Zener relaxation in ferrite phase. Based on the analyses of the area under peaks, the conclusions on the temperature range of the secondary austenite formation were drawn. Using internal friction method, hydrogen behavior in the austenite phase was studied. A complex Snoek-like peak caused by hydrogen was observed in the austenite phase. The effects of secondary phase precipitation on the hydrogen transport are discussed.

    Original languageEnglish
    Title of host publicationADVANCES IN MECHANICAL BEHAVIOUR, PLASTICITY AND DAMAGE
    EditorsD Miannay, P Costa, D Francois, A Pineau
    PublisherElsevier Science B.V.
    Pages865-870
    Number of pages6
    ISBN (Print)0-08-042815-0
    Publication statusPublished - 2000
    MoE publication typeA4 Article in a conference publication
    EventEuropean Conference on Advances in Mechanical Behaviour, Plasticity and Damage - Tours, France
    Duration: 7 Nov 20009 Nov 2000

    Conference

    ConferenceEuropean Conference on Advances in Mechanical Behaviour, Plasticity and Damage
    Abbreviated titleEUROMAT
    CountryFrance
    CityTours
    Period07/11/200009/11/2000

    Keywords

    • super duplex stainless steel
    • phase transformation
    • sigma phase
    • secondary austenite
    • internal friction
    • Snoek-like peak
    • RECRYSTALLIZATION
    • ALLOYS

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